v3.26.1
Debt (Schedule Long-Term Indebtedness) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Unamortized discount - net $ (10,100) $ (10,300)
Deferred financing costs (35,800) (36,500)
Long-term debt 3,904,193 3,903,377
Less: Current Portion of Long-term Debt 90,000 89,902
Net Consolidated IPALCO Long-term Debt 3,814,193 3,813,475
Maximum borrowing capacity 500,000  
Line of Credit Facility, Accordion Feature Increase Limit 200,000  
Finance Lease, Liability, Current 109 154
Finance Lease, Liability, Noncurrent 107,048 107,079
Obligations    
Debt Instrument [Line Items]    
Finance Lease, Liability, Current 100 200
Finance Lease, Liability, Noncurrent 107,000 107,100
Indianapolis Power And Light Company [Member]    
Debt Instrument [Line Items]    
Unamortized discount - net (8,924) (9,021)
Long-term debt $ 3,037,613 3,037,074
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due January 2034 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 6.60%  
First mortgage bonds $ 100,000 100,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.05% Due October 2036 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 6.05%  
First mortgage bonds $ 158,800 158,800
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due June 2037 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 6.60%  
First mortgage bonds $ 165,000 165,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.875% Due November 2041 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.875%  
First mortgage bonds $ 140,000 140,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.65% Due June 2043 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.65%  
First mortgage bonds $ 170,000 170,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.50% Due June 2044[Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.50%  
First mortgage bonds $ 130,000 130,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.70%, Due September 2045 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.70%  
First mortgage bonds $ 260,000 260,000
Indianapolis Power And Light Company [Member] | FMB Twenty [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.05%  
First mortgage bonds $ 350,000 350,000
Indianapolis Power And Light Company [Member] | FMB Twenty - one [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.875%  
First mortgage bonds $ 105,000 105,000
Indianapolis Power And Light Company [Member] | FMB Twenty - two    
Debt Instrument [Line Items]    
Debt, stated interest rate 0.75%  
Indianapolis Power And Light Company [Member] | FMB Twenty - three    
Debt Instrument [Line Items]    
Debt, stated interest rate 0.95%  
First mortgage bonds $ 60,000 60,000
Indianapolis Power And Light Company [Member] | FMB Twenty - four    
Debt Instrument [Line Items]    
Debt, stated interest rate 1.40%  
First mortgage bonds $ 55,000 55,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond Twenty Six    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.65%  
First mortgage bonds $ 350,000 350,000
Indianapolis Power And Light Company [Member] | FMB Twenty Seven    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.70%  
First mortgage bonds $ 650,000 650,000
Indianapolis Power And Light Company [Member] | FMB 2026    
Debt Instrument [Line Items]    
First mortgage bonds $ 30,000 30,000
Indianapolis Power And Light Company [Member] | FMB 2035 - 5.05%    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.05%  
First mortgage bonds $ 350,000 350,000
Ipalco Enterprises, Inc. [Member]    
Debt Instrument [Line Items]    
Unamortized discount - net (1,220) (1,249)
Deferred financing costs (7,200) (7,448)
Net Consolidated IPALCO Long-term Debt 866,580 866,303
Ipalco Enterprises, Inc. [Member] | 5.00% Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 400,000 400,000
Ipalco Enterprises, Inc. [Member] | Four Point Two Five Percent Senior Secured Notes    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.25%  
Long-term debt $ 475,000 475,000
Parent | Five Point Seven Five Percent Senior Secured Notes    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.75%  
First Mortgage Bonds [Member] | Indianapolis Power And Light Company [Member]    
Debt Instrument [Line Items]    
Deferred financing costs $ (27,263) (27,705)
Line of Credit [Member] | Committed Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit, outstanding borrowings $ 30,000 $ 0